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Armour Rings

The Permafix Armour Ring bolt head protectors ® are a patented simple conical collars that fit over standard nuts or bolts to make them tamper resistant.

The design of the rings allow them to be used to protect either a bolt head or a nut. Once the bolt (and or nut) is fully tightened, simply position the Armour Ring over it and tap home with a hammer.


(International Patent No. 9119559.4)






After installing the nut and bolt, Armour Rings

can be used as shown above, on the bolt head

and the nut for maximum protection

Home Office Approved

Once installed Armour Rings are very difficult to remove making them a very effective deterrent to tampering with the nut / bolt fixings.

Versatile and affordable, Armour rings are used for an extensive range of applications including; the installation of security grilles, etc., while use by local authorities includes securing park benches and street furniture among a wide range of other uses.

Permafix Armour Rings are available in BZP (mild steel with Bright Zinc Plate finish) and A2 stainless steel, and will fit any "British Standard" or "DIN Standard" hex nuts or bolts.

Available in the following stock sizes:   M6, M8, M10, M12 and M16     ...larger sizes can be manufactured to order

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Armour Ring Stock Sizes & Materials:


armour ring stock sizes BZP


armour ring stock sizes A2

Armour Ring - Technical Data

armour ring dimensions

Optional Installation Tool (speed up your installation with these practical aids)

armour ring tooling

armour ring tooling dimensions


Armour Ring Installation:

armour ring installation



armour ring uses




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